Chromium trioxide
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| Chromium trioxide | |
|---|---|
 |
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| General | |
| Systematic name | Chromium(VI) oxide |
| Molecular formula | CrO3 |
| SMILES | O=[Cr](=O)(O) |
| Molar mass | 100.0 g/mol |
| Appearance | dark red solid |
| CAS number | [1333-82-0] |
| Properties | |
| Density and phase | 2.70 g/cm3, solid |
| Solubility in water | 63 g/100 ml (? °C) |
| Melting point | 197 °C |
| Boiling point | 250 °C decomp. |
| Acidity (pKa) | 0.74 |
| Hazards | |
| MSDS | External MSDS |
| EU classification | Oxidant (O) Highly toxic (T+) Carc. Cat. 1 Muta. Cat. 2 Repr. Cat. 3 Dangerous for the environment (N) |
| NFPA 704 |    |
| R-phrases | R45, R46, R9, R24/25, R26, R35, R42/43, R48/23, R62, R50/53 |
| S-phrases | S53, S45, S60, S61 |
| RTECS number | GB6650000 |
| Supplementary data page | |
| Structure & properties | n, εr, etc. |
| Thermodynamic data | Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | Vanadium pentoxide Manganese heptoxide Molybdenum trioxide Tungsten trioxide |
| Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) Infobox disclaimer and references |
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The acid anhydride of chromic acid is chromium trioxide or chromium(VI) oxide; industrially, this compound is sometimes sold as "chromic acid". [1]
This compound is an intensely-colored dark red/orange brown, water-soluble, granular solid which is stable by itself, but is a strong oxidant which will react when mixed with many things that can be oxidized. Ethanol, for example, will ignite on contact with it.
[edit] Production
Chromium trioxide is produced commercially by the reaction of sodium dichromate with concentrated sulfuric acid.[2]
[edit] Health Risks
Chromium trioxide is highly toxic, corrosive, and carcinogenic. [3]
